3. The installation process is simple, I followed the guide from tonymacx86.com site and did not use APFS.

4. I also did not use any Boot Args but you can use -v so you can detect when when you encounter issues.

5. Remember to always select Inject Intel and Input FakeID : 0x19120000 at the Clover Boot Screen Each time the system restarts during the installation. VERY IMPORTANT.... OTHERWISE SYSTEM WILL BOOT TO BLACK SCREEN. After replacing your EFI folder in the next step, you would not need to do this anymore..

6. After the installation is complete, download latest Clover Configurator and mount your boot drive EFI partition and copy the EFI Folder attached to this Post to the EFI partition and select REPLACE.

7. Restart

Conclusion: macOS High Sierra should now be working on your HP EliteDesk 800 G2 / ProDesk 600 G2 CustoMac.